decay-grid/Assets/Scripts/Infrastructure/Unity/PlayerController.cs

using System;
using Core.Domain.Status;
using KBCore.Refs;
using UnityEngine;
using UnityEngine.InputSystem;

namespace Infrastructure.Unity
{
    [RequireComponent(typeof(Rigidbody))]
    public class PlayerController : MonoBehaviour
    {
        [Header("Movement Settings")]
        [SerializeField]
        private float moveSpeed = 8f;
        [SerializeField] private float maxVelocityChange = 10f;
        [SerializeField] private float snapForce = 15f;

        [Header("Controls")]
        [SerializeField] private bool useCameraRelativeMovement = true;

        [Header("Interaction")]
        [SerializeField] private LayerMask tileLayer;
        [SerializeField] private float groundCheckDistance = 1.5f;

        [Self][SerializeField] private Rigidbody rb;

        private InputSystem_Actions _actions;
        private Vector2 _moveInput;
        private Transform _camTransform;

        public Rigidbody Rigidbody => rb;
        public StatusManager Status { get; private set; }

        private void OnEnable()
        {
            _actions.Player.Enable();

            _actions.Player.Move.performed += OnMovePerformed;
            _actions.Player.Move.canceled += OnMoveCanceled;
        }

        private void OnDisable()
        {
            _actions.Player.Move.performed -= OnMovePerformed;
            _actions.Player.Move.canceled -= OnMoveCanceled;

            _actions.Player.Disable();
        }

        private void Awake()
        {
            _actions = new InputSystem_Actions();
            Status = new StatusManager();

            if (Camera.main)
            {
                _camTransform = Camera.main.transform;
            }

            rb.freezeRotation = true;
            // RB gravity is controlled by capabilities
        }

        private void Update()
        {
            Status.Tick(Time.deltaTime);

            // Apply Status logic
            rb.useGravity = !Status.CurrentCapabilities.CanHover;
        }

        private void FixedUpdate()
        {
            HandleMovement();
            DetectGround();
        }

        private void HandleMovement()
        {
            var currentSpeed = moveSpeed * Status.CurrentCapabilities.SpeedMultiplier;
            var targetVelocity = Vector3.zero;
            var snapAxis = Vector3.zero;

            Vector3 desiredDirection;

            if (_moveInput.sqrMagnitude < 0.01f)
            {
                desiredDirection = Vector3.zero;
            }
            else if (useCameraRelativeMovement && _camTransform)
            {
                var camForward = _camTransform.forward;
                var camRight = _camTransform.right;
                camForward.y = 0;
                camRight.y = 0;
                camForward.Normalize();
                camRight.Normalize();

                desiredDirection = (camForward * _moveInput.y + camRight * _moveInput.x).normalized;
            }
            else
            {
                desiredDirection = new Vector3(_moveInput.x, 0, _moveInput.y).normalized;
            }


            if (desiredDirection.sqrMagnitude > 0.01f)
            {
                if (Mathf.Abs(desiredDirection.x) > Mathf.Abs(desiredDirection.z))
                {
                    targetVelocity = new Vector3(Mathf.Sign(desiredDirection.x) * currentSpeed, 0, 0);
                    snapAxis = Vector3.forward;
                }
                else
                {
                    targetVelocity = new Vector3(0, 0, Mathf.Sign(desiredDirection.z) * currentSpeed);
                    snapAxis = Vector3.right;
                }
            }

            var velocity = rb.linearVelocity;
            var velocityChange = (targetVelocity - velocity);

            velocityChange.x = Mathf.Clamp(velocityChange.x, -maxVelocityChange, maxVelocityChange);
            velocityChange.z = Mathf.Clamp(velocityChange.z, -maxVelocityChange, maxVelocityChange);
            velocityChange.y = 0f;

            rb.AddForce(velocityChange, ForceMode.VelocityChange);

            if (snapAxis != Vector3.zero)
            {
                ApplySnapping(snapAxis);
            }
            else
            {
                ApplySnapping(Vector3.right);
                ApplySnapping(Vector3.forward);
            }
        }

        private void ApplySnapping(Vector3 axis)
        {
            var currentPos = Vector3.Dot(transform.position, axis);
            var targetPos = Mathf.Round(currentPos);

            var diff = targetPos - currentPos;

            var correction = axis * (diff * snapForce);
            rb.AddForce(correction, ForceMode.Acceleration);
        }

        private void DetectGround()
        {
            if (!Status.CurrentCapabilities.CanTriggerDecay) return;

            if (Physics.Raycast(transform.position, Vector3.down, out var hit, groundCheckDistance, tileLayer))
            {
                if (hit.collider.TryGetComponent<TileViewAdapter>(out var tileAdapter))
                {
                    tileAdapter.OnPlayerStep();
                }
            }
        }

        private void OnMovePerformed(InputAction.CallbackContext ctx)
        {
            _moveInput = ctx.ReadValue<Vector2>();
        }

        private void OnMoveCanceled(InputAction.CallbackContext ctx)
        {
            _moveInput = Vector2.zero;
        }
    }
}